Optical recording medium driving apparatus, high frequency superposition method, and program

Abstract

An optical recording medium driving apparatus includes: a driving signal generating unit that generates a driving signal for driving a laser beam source; a high frequency superposition unit that performs high frequency superposition on the driving signal; a light receiving unit that receives an optical feedback of a laser beam; an evaluation signal generating unit that generates an evaluation signal from a light reception signal; a storage unit that stores first high frequency superposition amount information corresponding to a high frequency superposition amount for a normal reproduction mode and second high frequency superposition amount information corresponding to an amount that is greater than that represented by the first high frequency superposition amount information; and a superposition amount control unit that performs control so that a high frequency superposition amount based on the second high frequency superposition amount information is set when measuring an evaluation index based on the evaluation signal.

Description

technical field [0001] The present technology relates to an optical recording medium drive device having the capability of high-frequency superimposition of laser drive currents, such as an optical recording medium drive device configured to reproduce at least from an optical recording medium, and a high-frequency superimposition method thereof. The present technology also relates to a program to be executed by the above-described optical recording medium drive apparatus. Background technique [0002] Optical disc recording media (hereinafter also referred to as “optical discs”) including, for example, compact discs (CDs), digital versatile discs (DVDs), and Blu-ray (BD, registered trademark) discs are widely used. [0003] When the laser is driven to emit light at a power level as low as the read power level, some optical recording medium drive apparatuses configured to record and reproduce optical discs as listed above perform high-frequency superposition of the laser driv...

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Problems solved by technology

[0004] However, in such an optical recording medium drive apparatus, if the amount of high-frequency superimposition (hereinafter also referred to as "high-frequency superimposition amount") is too low, the following problems will be caused: data reproducibility deteriorates, and the spoon ratio ( scoop ratio) (that is, the rate of change of the laser beam emission amount relative to the laser beam reflection amount caused by recording marks and space portions) increases, making it difficult to accurately measure the β value associated with the quality of the recording signal, etc., Modulation factors and other evaluation indices

[0006] However, increasing the amount of high frequency superposition introduces another problem of unwanted radiated noise increase

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